1 /* 2 * Copyright (C) 2011 by Vladimir Zapolskiy <vz@mleia.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/arch/cpu.h> 9 #include <asm/arch/clk.h> 10 #include <asm/arch/uart.h> 11 #include <asm/io.h> 12 13 static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE; 14 static struct uart_ctrl_regs *ctrl = (struct uart_ctrl_regs *)UART_CTRL_BASE; 15 16 void lpc32xx_uart_init(unsigned int uart_id) 17 { 18 if (uart_id < 1 || uart_id > 7) 19 return; 20 21 /* Disable loopback mode, if it is set by S1L bootloader */ 22 clrbits_le32(&ctrl->loop, 23 UART_LOOPBACK(CONFIG_SYS_LPC32XX_UART)); 24 25 if (uart_id < 3 || uart_id > 6) 26 return; 27 28 /* Enable UART system clock */ 29 setbits_le32(&clk->uartclk_ctrl, CLK_UART(uart_id)); 30 31 /* Set UART into autoclock mode */ 32 clrsetbits_le32(&ctrl->clkmode, 33 UART_CLKMODE_MASK(uart_id), 34 UART_CLKMODE_AUTO(uart_id)); 35 36 /* Bypass pre-divider of UART clock */ 37 writel(CLK_UART_X_DIV(1) | CLK_UART_Y_DIV(1), 38 &clk->u3clk + (uart_id - 3)); 39 } 40